I have to agree with PP's about the Studios - counter service there is pretty bad. Popcorn for lunch, followed by ice cream for dessert can be a good thing.
At the MK, we like Columbia Harbor House. Casey's Corner is OK if you just want a hot dog. All places have universally bad french fries so we opt for the fruit.
At AK, we like Flame Tree. Unless it is hot, then we tend to eat a bad burger at Restaurantosaurus because I don't like eating outside in the heat and the pizza at Pizzafari is just plain awful. Frozen Disney pizza at its worst.
Epcot is the best counter service. Sunshine Seasons, Boulangerie Patisserie, Fish and Chips are all favorites. Didn't get a chance to try the new Cantina in Mexico two weeks ago but we are looking forward to trying it.